SHRDLU
1970 MIT program that conversed in English about a simulated blocks world, demonstrating both the promise and limits of natural language understanding in constrained domains.
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SHRDLU Natural Language Understanding Program Developed by Terry Winograd at MIT
In 1970, Terry Winograd at the Massachusetts Institute of Technology completed SHRDLU, a natural language understanding program that allowed a user to converse in English about a simulated world of coloured blocks, demonstrating that a computer could parse and respond to complex grammatical instructions within a constrained domain.